Detect hw and wire active console and TTY

src/gopheros/kernel/hal/hal.go

@@ -1,23 +1,67 @@
 package hal
 
 import (
-	"gopheros/kernel/driver/tty"
-	"gopheros/kernel/driver/video/console"
-	"gopheros/kernel/hal/multiboot"
+	"gopheros/device"
+	"gopheros/device/tty"
+	"gopheros/device/video/console"
+	"gopheros/kernel/kfmt"
 )
 
-var (
-	egaConsole = &console.Ega{}
-
-	// ActiveTerminal points to the currently active terminal.
-	ActiveTerminal = &tty.Vt{}
-)
-
-// InitTerminal provides a basic terminal to allow the kernel to emit some output
-// till everything is properly setup
-func InitTerminal() {
-	fbInfo := multiboot.GetFramebufferInfo()
-
-	egaConsole.Init(uint16(fbInfo.Width), uint16(fbInfo.Height), uintptr(fbInfo.PhysAddr))
-	ActiveTerminal.AttachTo(egaConsole)
+// managedDevices contains the devices discovered by the HAL.
+type managedDevices struct {
+	activeConsole console.Device
+	activeTTY     tty.Device
+}
+
+var devices managedDevices
+
+// ActiveTTY returns the currently active TTY
+func ActiveTTY() tty.Device {
+	return devices.activeTTY
+}
+
+// DetectHardware probes for hardware devices and initializes the appropriate
+// drivers.
+func DetectHardware() {
+	consoles := probe(console.HWProbes())
+	if len(consoles) != 0 {
+		devices.activeConsole = consoles[0].(console.Device)
+	}
+
+	ttys := probe(tty.HWProbes())
+	if len(ttys) != 0 {
+		devices.activeTTY = ttys[0].(tty.Device)
+		devices.activeTTY.AttachTo(devices.activeConsole)
+		kfmt.SetOutputSink(devices.activeTTY)
+
+		// Sync terminal contents with console
+		devices.activeTTY.SetState(tty.StateActive)
+	}
+}
+
+// probe executes the supplied hw probe functions and attempts to initialize
+// each detected device. The function returns a list of device drivers that
+// were successfully initialized.
+func probe(hwProbeFns []device.ProbeFn) []device.Driver {
+	var drivers []device.Driver
+
+	for _, probeFn := range hwProbeFns {
+		drv := probeFn()
+		if drv == nil {
+			continue
+		}
+
+		major, minor, patch := drv.DriverVersion()
+
+		kfmt.Printf("[hal] %s(%d.%d.%d): ", drv.DriverName(), major, minor, patch)
+		if err := drv.DriverInit(); err != nil {
+			kfmt.Printf("init failed: %s\n", err.Message)
+			continue
+		}
+
+		drivers = append(drivers, drv)
+		kfmt.Printf("initialized\n")
+	}
+
+	return drivers
 }